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use async_task::Builder;
use futures_util::Future;
use std::collections::VecDeque;
use std::pin::Pin;
use std::sync::atomic::{AtomicUsize, Ordering};
use std::sync::{Arc, Mutex};
use std::task::{Context, Poll};
use crate::scheduler::{Executor, LamellarExecutor, LamellarTask, LamellarTaskInner};
use tracing::{debug, trace};
static TASK_ID: AtomicUsize = AtomicUsize::new(0);
#[derive(Debug)]
pub(crate) struct SingleThread {
queue: Arc<Mutex<VecDeque<async_task::Runnable<usize>>>>,
}
impl SingleThread {
pub(crate) fn new() -> Self {
let queue = Arc::new(Mutex::new(VecDeque::new()));
Self { queue }
}
// fn schedule<F>(&self, task_id: usize, future: F) -> async_task::Task<F::Output,usize>
// where
// F: Future + Send + 'static,
// F::Output: Send,
// {
// let queue = self.queue.clone();
// let schedule = move |runnable| {
// let mut guard = queue.lock().unwrap();
// guard.push_back(runnable);
// trace!("Scheduled task {:?} on single thread executor", task_id);
// };
// let (runnable, task) = Builder::new()
// .metadata(task_id)
// .spawn(move |task_id| async move {
// trace!(
// "[{:?}] Running task {:?} on single thread executor",
// std::thread::current().id(),
// task_id
// );
// future.await
// }, schedule);
// runnable.schedule();
// task
// }
fn run_one_task(&self) -> bool {
let task = {
let mut guard = self.queue.lock().unwrap();
guard.pop_front()
};
if let Some(run) = task {
run.run();
true
} else {
false
}
}
}
impl LamellarExecutor for SingleThread {
fn spawn_task<F>(&self, task: F, executor: Arc<Executor>) -> LamellarTask<F::Output>
where
F: Future + Send + 'static,
F::Output: Send,
{
let task_id = TASK_ID.fetch_add(1, Ordering::Relaxed);
let queue = self.queue.clone();
let schedule = move |runnable| {
let mut guard = queue.lock().unwrap();
guard.push_back(runnable);
// trace!("Scheduled task {:?} on single thread executor", task_id);
};
let _id = task_id;
let (runnable, task) = Builder::new().metadata(task_id).spawn(
move |_task_id| async move {
// trace!(
// "[{:?}] Running task {id} on single thread executor",
// std::thread::current().id(),
// );
let res = task.await;
// trace!(
// "[{:?}] Completed task {id} on single thread executor",
// std::thread::current().id(),
// );
res
},
schedule,
);
runnable.schedule();
LamellarTask {
task: LamellarTaskInner::LamellarTask(Some(task)),
executor,
task_id,
}
}
fn submit_task<F>(&self, task: F)
where
F: Future + Send + 'static,
F::Output: Send,
{
let task_id = TASK_ID.fetch_add(1, Ordering::Relaxed);
let queue = self.queue.clone();
let schedule = move |runnable| {
let mut guard = queue.lock().unwrap();
guard.push_back(runnable);
// trace!("Scheduled task {:?} on single thread executor", task_id);
};
let _id = task_id;
let (runnable, task) = Builder::new().metadata(task_id).spawn(
move |_task_id| async move {
// trace!(
// "[{:?}] Running task {id} on single thread executor",
// std::thread::current().id(),
// );
let res = task.await;
// trace!(
// "[{:?}] Completed task {id} on single thread executor",
// std::thread::current().id(),
// );
res
},
schedule,
);
runnable.schedule();
task.detach();
// Self::detach_task(&mut task_inner);
}
fn submit_task_thread<F>(&self, task: F, _tid: usize)
where
F: Future + Send + 'static,
F::Output: Send,
{
self.submit_task(task);
}
fn submit_io_task<F>(&self, task: F)
where
F: Future + Send + 'static,
F::Output: Send,
{
self.submit_task(task);
}
fn submit_immediate_task<F>(&self, task: F)
where
F: Future + Send + 'static,
F::Output: Send,
{
self.submit_task(task);
}
fn exec_task(&self) {
self.run_one_task();
}
fn block_on<F: Future>(&self, future: F) -> F::Output {
let task_id = TASK_ID.fetch_add(1, Ordering::Relaxed);
let queue = self.queue.clone();
let schedule = move |runnable| {
let mut guard = queue.lock().unwrap();
guard.push_back(runnable);
// trace!(
// "block on Scheduled task {:?} on single thread executor",
// task_id
// );
};
let (runnable, mut task) = unsafe {
Builder::new().metadata(task_id).spawn_unchecked(
move |_task_id| async move {
// trace!(
// "[{:?}] block on Running task {:?} on single thread executor",
// std::thread::current().id(),
// task_id
// );
let res = future.await;
// trace!(
// "[{:?}] block on Completed task {:?} on single thread executor",
// std::thread::current().id(),
// task_id
// );
res
},
schedule,
)
};
let waker = runnable.waker();
runnable.run();
while !task.is_finished() {
self.run_one_task();
}
let cx = &mut Context::from_waker(&waker);
if let Poll::Ready(output) = Pin::new(&mut task).poll(cx) {
output
} else {
println!(
"[{:?}] single_thread block on failed -- task id{:?}",
std::thread::current().id(),
task.metadata()
);
panic!("Task should be ready");
}
}
fn num_workers(&self) -> usize {
1
}
// fn active(&self) -> bool {
// self.status.load(Ordering::SeqCst) == SchedulerStatus::Active as u8
// }
fn shutdown(&self) {
debug!("Shutting down SingleThread executor");
while self.run_one_task() {}
debug!("SingleThread executor shutdown complete");
}
fn force_shutdown(&self) {
self.shutdown();
}
}
impl Drop for SingleThread {
fn drop(&mut self) {
trace!(target: "drop", "Dropped SingleThread Scheduler");
}
}